Technical data

148 Theoretical and general applications www.westermo.com
Capacitance Ability to absorb an electrical charge.
Measured in microfarad = 10
–6
F = 1 µF
nanofarad = 10
–9
F = 1 nF
picofarad = 10
–12
F = 1 pF
CAT5 A copper twisted pair cable that supports bandwith up to
100 MHz or 1000 MHz when using all four pairs. Common
data rates are 100 Mbit/s or 1000 Mbit/s.
CAT5e Enhanced Cat 5 standard provides noice immunity.This is the
most common in new installations.
CHAP The Challenge Handshake Authentication Protocol is far more
secure than PAP. Along with requesting password information
during log-on, passwords are requested during challenge mode.
Failure to provide an identical character or password will termi-
nate the connection.
Checksum Result of a mathematical function that controls whether the data
transfer is correct.
Client Server A LAN solution where data processing and software are shared
between personal computers (clients) and a server.
Clock A regular frequency sent from a signal source (clock pulse gener-
ator) which, among others, is used to set speed rates, for exam-
ple, of the data flow with serial transfer.
CMV Common Mode Voltage, longitudinal voltage, usually inductively
generated.
Coaxial cable A cable with a screened outer casing and protected conductor
for fast and interference insensitive data transfer.
Collision The result when two or more devices try to transmit data
on the same network at the same time.The data when this
occurs is corrupted.
CSD Circuit Switched Data,The most common form to transfer data
via the GSM network.
CSMA/CD Carrier Sense Multiple Access/Collision Detect.This is the
Ethernet media access method where all devices equally
contend for access to the network to transmit data. If a device
detects another device’s signal whilst attempting to transmit, the
transmission is aborted and a retry is attempted after a delay.
Current Loop A current loop is a serial transfer method that converts between
absence and presence of a current on a wire pair.
B A C K